A 7-year-old boy received an operation on Tuesday successfully he has many other health problems.
A. since
B. however
C. though
D. therefore
网友回答
A. since
B. however
(答案→)C. though
D. therefore
解析：考查状语从句。介意：一个七岁大的男孩在周二成功接受了手术，尽管他还有许多其它的健康问题。A既然；B然而；C尽管；D所以。故选C。